From Wiktionary, the free dictionary
From acanth- (“spine”) + -ous (“having”).[1]
acanthous (comparative more acanthous, superlative most acanthous)
- (botany) Synonym of spinous
- ^ Philip Babcock Gove (editor), Webster's Third International Dictionary of the English Language, Unabridged (G. & C. Merriam Co., 1976 [1909], →ISBN)